Writing instrument



FIG. 1 is a left side perspective view taken from the front and above showing our new design;

FIG. 2 is a right side elevational view, the left side elevational view being a mirror image thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a plan view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a “writing instrument”, as shown and described. 